how to get the value a argument which modified by webservice

hi,every one,
    In our application ,there are a webservice, the webservice provide a
method, the method accept a argument, the argument is a class, at the
server, the argument will be modified. the prototype of the method is
bool GetInfo （IN int iInfoID, OUT Info PI）;
i wonder if ksoap supports to call this kind of webservice?  how can i pass
the argument and get the result?
thanks;